import { WaybackConfig, WaybackItem } from '../types';
/**
 * Get Wayback Configuration file that provides information about all World Imagery Wayback releases.
 * This function retrieves the Wayback Configuration data asynchronously, caching it for subsequent calls.
 * @returns {Promise<WaybackConfig>} A Promise resolving to the Wayback Configuration data.
 */
export declare const getWaybackConfigData: () => Promise<WaybackConfig>;
/**
 * Validates a WaybackItem object to ensure it has required properties.
 * @param item The WaybackItem to validate.
 * @returns True if valid, false otherwise.
 */
export declare const isValidWaybackItem: (item: any) => item is WaybackItem;
/**
 * Get an array of data for all World Imagery Wayback releases/versions.
 *
 * This function retrieves an array of Wayback items from the Wayback Configuration data,
 * sorting them by release date in descending order (newset release is the first item) and caching the result for subsequent calls.
 *
 * @returns {Promise<WaybackItem[]>} A Promise resolving to an array of Wayback items.
 */
export declare const getWaybackItems: () => Promise<WaybackItem[]>;
/**
 * Retrieves a specific World Imagery Wayback item based on the provided release number.
 * It utilizes a Map named waybackItemByReleaseNumber to efficiently
 * retrieve wayback items by their release numbers.
 *
 * @param releaseNumber The release number of the wayback item to retrieve
 * @returns A Promise that resolves with the wayback item corresponding to the provided release number.
 *          If the wayback item for the given release number is not found, it returns undefined.
 */
export declare const getWaybackItemByReleaseNumber: (releaseNumber: number) => Promise<WaybackItem | undefined>;